Looking for a VT100 advanced video option board

Tony Duell ard at p850ug1.demon.co.uk
Sun Feb 21 12:32:00 CST 2010

> I'm looking for a VT100 advanced video option board. Or, failing that, 
> if anyone has a .100 spacing, 50 pin dual row female connector so I can 
> makes one... 
> The circuit is really simple, it's just a plug-in board that gives the 
> VT100 some extra RAM so it can display 24 lines of text in 132 column 
> mode, and do some extra character attributes. I cooked up plans to build 
> my own based on the schematics in the printset (and using some newer 
> SRAMs), but when I actually pulled the logic board out of the terminal I 
> realized that the header connector it plugs into is a stupid spacing - 
> .1 instead of the usual .156. 

Haven;'t you got that last part backwards? The common 2-row pin headers 
are 0.1" pitch. IIRC the header for the Advanced Video Option is wider 
spacing, quite possibly 0.156", but I would measure it before tying to 
get something to fit (DEC also used 0.125" pitch connectors...)


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